README

A modular, extensible library for PHP >= 5.6 providing APIs to support parsing & manipulation of semantic version numbers, comparators, ranges & collections.

The Semantic Versioning Specification describes the semantics and precedence rules used when parsing & manipulating version numbers etc.

Usage

Parse Version

First create an instance of the VersionEngine:

    use ptlis\SemanticVersion\VersionEngine();

    $engine = new VersionEngine();

Then call the parseVersion method passing a version number:

    $version = $engine->parseVersion('1.5.0-rc.1');

On failure to parse a \RuntimeException will be thrown.

Parse Version Range

Again, create an instance of the VersionEngine:

    use ptlis\SemanticVersion\VersionEngine();

    $engine = new VersionEngine();

Then call the parseVersionRange method passing a version range:

    $version = $engine->parseVersion('1.5.0-3.0.0');

As before, on failure to parse a \RuntimeException will be thrown.

Versions

The Version class provides a simple value type representing a semantic version number.

It provides simple accessors for the components of a semantic version number:

    echo $version->getMajor();  // '1'
    echo $version->getMinor();  // '5'
    echo $version->getPatch();  // '0'
    echo $version->getLabel();  // 'rc.1'

A __toString implementation:

    echo $version;  // '1.5.0-rc.1'

Version also implement SatisfiedByVersionInterface so offer the isSatisfiedBy method which returns true if the versions match.

Version Ranges

Version ranges are bundles of objects representing a version range constraint, represented by classes implementing VersionRangeInterface.

The simplest version range is a version and a comparator (e.g. >=2.5.3, '<1.0.0'), which is expressed by the ComparatorVersion class.

A more complex range would be one with an upper and lower bound (e.g. ~1.0.0, '^1.0.0', '>=1.0.0,<2.0.0' which are all equivalent). This is expressed via the LogicalAnd class wrapping two ComparatorVersion instances.

The most complex constraint would be one containing two ranges (e.g. 1.2.5-2.3.2|^4.0.0). This is expressed via Wrapping the two classes implementing VersionRangeInterface.

As VersionRangeInterface extends SatisfiedByVersionInterface these implement the isSatisfiedBy method which returns true if the passed version satisfies the constraint.

Known limitations

There currently are a few areas where this library deviates from the specification when dealing with labels & build metadata; this is to due to how the parsing of version-ranges is handled. However, having tested the parsing code against the complete list of packages scraped from packagist I found no packages affected by this.

Example semantic versions which are valid but the library is unable to parse:

• 1.0.0-0.3.7
• 1.0.0-beta-17